Lock.



M. MORRIS. LOCK.

APPLICATION FILED FEB. I. 1915.

1,159,067. Patented Nov. 2, 1915.

3555135565: flaw/L266 N1 sac MILTON MORRIS, OF'GHICAGO, InIgnvoIfs'.

LOCK."

To all whom it may concern: Be it known that I, MILTON MORRIS,- acitizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented a certain new and usefulImprovement in Locks, of which the following is a specification.

My invention relates to locks, and the object of the invention is toprovide means which not only enter into the keeper plate, but arecapable of actually engaging the same so that said plate cannot be priedaway from the face plate of the look.

In the accompanying drawings which show an embodiment of the inventionFigure 1 is an elevation showing the outer end of the lock. Figs. 2 and3 are side elevations, partly in section, showing the movable parts indifi'erent position, and Fig. 4 is a perspective view of one of thetoothed segmental auxiliary locking elements.

Similar numerals refer to similar parts throughout the several views.

In the form selected to illustrate the invention, the lock casing 1 isprovided with a face plate 2, said face plate having a rectangular boltopening 3 therein as usual, and cooperating in the usual manner, withthe keeper plate 4, which has a rectangular opening 5 for receivingthebolt.

7 My invention contemplates any kind of mechanism for moving the bolt 6.In the form illustrated said bolt is guided by a post 7 projecting intoa longitudinal slot 8 in the bolt. The lug 9 also serves to guide saidbolt and the inward'movement of the latter is limited by a stop 10*. Thebolt is operated by a rotary arm 10 operated by any suitable keymechanism. In the particular form of lock shown, a dog 11 is mountedupon the bolt and pivoted upon the pintle 12 projecting from said bolt.This dog has a lug 13 which is adapted to abut the front and rear endsof post 7 to. lock the bolt in retracted and projected position. Saiddog is urged" toward said post by a spring 14 and is lifted into and outof engagement with the post 7 by the arm 10 which engages the finger 15formed at the inner end of the dog.

So far as the parts have been thus far described they are old and may begreatly varied without departing from the spirit of the invention.

Specification of Letters Patent.

1 plate.

I will now describe the parts which more particularly distinguish mylook from others.

The bolt is provided with rack teeth 18 which engage teeth 19 on theauxiliary locking'elements 20. Said locking elements aresegmental andhave circular edges 21 at the back which slide upon the edges of theopening in the face plate 2'. The result is that when the parts areprojected from the normal position shown in Fig. 2, said auxiliarylocking elements will swing laterally as they moveforward and willengage the inside of the keeper plate 4 as shown in Fig. 3. In otherwords, the parts 20 swing both out ward and forward and engage the inneredge of the keeperplate at the opening 5 therein in such manner as toprevent the keeper from being pried away from the face Consequentlythere is no possible way of opening the door by forcing a jimmy betweenthe face plate and the keeper plate except by actually breaking theparts, and

it will-be noted that in my device the locking parts are full size andof rugged con Patented Nov. 2, 1915.

Application filed February 1, 1915. Serial N 0L 5,350.v I i struction,and hence afford little orv no danger of being broken. V

Having thus described my invention, what I claim as new and desire tosecure by Letters'Patent, is

1. A'lock having a casing, a bolt sliding rectilinearly in said casing,said bolt having gear teeth along the edge, and a curved toothed rackforming an auxiliary locking element and making rolling contact withsaid bolt.

2. A look having a casing provided with a face plate having an opening,therein, a

bolt sliding in a straight line through said opening and having gearteeth arranged along the edge, and asegmental rack meshing with theteeth on the bolt and held in mesh by the adjacent edge of the faceplate.

3. A look having a casing provided with a face plate having an openingtherein, a

bolt sliding in a straight line through said opening and having gearteeth along the edge, and a toothed rack also sliding through saidopening and meshing with the teeth on the bolt, said rack being curvedand having its rear curved edge making sliding contact with the adjacentedge of the face plate, whereby the curved rack is held. in

mesh by the face plate and said rack makes, ing them in engagement withthe straight 10 rolling contact with the bolt. rack. V

4. A look having a casing provided with a In Witness whereof, I havehereunto subface plate having an opening therein, a scribed my name inthe presence of two witdouble edged straight rack, and two curvednesses.

racks meshing therewith in opposite sides MILTON MORRIS. thereof, saidstraight rack constituting a WVitnesses:

bolt and sliding in a straight line, the face SAMUEL SC-HWEITZER,

plate backing up the curved racks and hold HOWARD M. COX.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

